Just like the title says, Multi streaming twitch doesn’t seem to work on brave.
I tried multi streaming two starcraft twitch streams on the website multistre.am, and the streams don’t play.
this is on a windows 10 desktop. Here is a link to the multi stream I was trying to get to work: https://multistre.am/x5_pig/starcraft/layout3/. this multi-stream works in chrome, but Brave. not a priority issue, but thought I should mention it.

You can try disabling your shields in the top right corner (lion icon) of your Brave browser and seeing if that helps. I noticed on that stream link that when I disabled shields, the bottom stream came alive and displayed an image. That might be the issue!